The word きみ is commonly used in media, but I am wondering how often that term is actually used in real life, and in what situations? Detailed responses are preferred if possible.

質問を翻訳

To me, it's only when a higher ranked person in workplace addresses to his subordinate. For that matter, between a college/university professor and his student, as well. Until high school, teachers call their students by last name.

「きみが好きだ。」(I love you, from a man to a woman) is a myth. Eh, I think. I've never heard it in real life. Only in TV dramas and in literature. Do people actually say that???

If a woman adresses to a man around the same age by きみ, it's her own style. Not common.

If a woman or a girl adresses to a boy of younger age by that, there found a respect and her being a big sister.

In men sports hierachy, it's おまえ rather than きみ. I don't know the situation in women's sports.